Page 14 - 2018-v.3-Part 2(EN)

TBIS 4210-2:2018

4.6.3 Attachment of brake assembly and cable requirements

Cable pinch bolts shall not sever any of the cable strands when assembled to the manufacturer’s
instructions. In the event of a cable failing, no part of the brake mechanism shall inadvertently inhibit
the rotation of the wheel.

The cable end shall either be protected with a cap that shall withstand a removal force of not less than
20 N or be otherwise treated to prevent unravelling.

NOTE See 4.3 in relation to fasteners.

4.6.4 Brake-block and brake-pad assemblies — Security test

The friction material shall be securely attached to the holder, backing plate, or shoe and there shall be
no failure of the braking system or any component thereof, and the brake shall meet the performance
requirements of 4.6.8 when tested by the method specified in TBIS 4210-4:2017 4.3.

4.6.5 Brake adjustment

Each brake shall be equipped with an adjustment mechanism, either manual or automatic.

Each brake shall be capable of adjustment with or without the use of a tool to an efficient operating
position until the friction material has worn to the point of requiring replacement as recommended in
the manufacturer’s instructions. Also, when correctly adjusted, the friction material shall not contact
anything other than the intended braking surface.

The brake blocks of a bicycle with rod brakes shall not come into contact with the rim of the wheels
when the steering angle of the handlebars is set at 60°, nor shall the rods bend, or be twisted after the
handlebars are reset to the central position.

4.6.6 Hand-operated braking-system — Strength test

When tested by the method described in TBIS 4210-4:2017, 4.4, there shall be no failure of the
braking system or of any component thereof.

4.6.7 Back-pedal braking system — Strength test

4.6.7.1 General

If the back-pedal braking system is fitted, the brake shall be actuated by the operator’s foot applying
force to the pedal in a direction opposite to that of the drive force. The brake mechanism shall function
regardless of any drive gear positions or adjustments. The differential between the drive and brake
positions of the crank shall not exceed 60°.

The measurement shall be taken with the crank held against each position with a pedal force of at least
250 N. The force shall be maintained for 1 min in each position.

4.6.7.2 Requirement

When tested in accordance with TBIS 4210-4:2017, 4.5, there shall be no failure of the brake system
or any component thereof.

4.6.8 Braking performance

4.6.8.1 General

Two test methods are specified to determine braking performance and experience has shown that
either method is suitable and either can be used. One test method is the track test in which braking
distance is measured directly with the progressive characteristics of the brakes being self-evident. The

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